..Although observational studies suggest that IVF is more effective than no treatment for women with Fallopian tube patency, this has not been tested rigorously in a randomized controlled trial (RCT)...

Cross-border fertility services in North America: a survey of Canadian and American providers

..Of the chemical contaminants detected in the serum and follicular fluid of these women, p,p'-DDE was the most frequently detected, had the highest residue levels, and was associated with failed fertilization...

..In conclusion, the best available evidence, though limited, suggests that the most clinically useful predictors of gonadotrophin ovulation induction outcome in normogonadotrophic women are obesity and insulin resistance...